SNR (Single Number Rating) is the rating system determined according to International Standard ISO4869. SNR's are expressed in decibels (dB) and are used as a guide for comparing noise reduction capability. generally the higher the SNR number the better performance the ear defenders give.

In addition to the SNR value you should consider the H, M and L values, H- High Frequencies, M - Medium Frequencies and L - Low frequencies, the value is the number of decibels that the ear defenders will block.

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